<html>
<head>
<title> JS千分位处理 </title>
</head>
<script>
function $$(id){return document.getElementById(id);} /**
* 数字格式转换成千分位
*@param{Object}num
*/
function commafy(num) {
//1.先去除空格,判断是否空值和非数
num = num + "";
num = num.replace(/[ ]/g, ""); //去除空格
if (num == "") {
return;
}
if (isNaN(num)){
return;
}
//2.针对是否有小数点，分情况处理
var index = num.indexOf(".");
if (index==-) {//无小数点
var reg = /(-?\d+)(\d{})/;
while (reg.test(num)) {
num = num.replace(reg, "$1,$2");
}
} else {
var intPart = num.substring(, index);
var pointPart = num.substring(index + , num.length);
var reg = /(-?\d+)(\d{})/;
while (reg.test(intPart)) {
intPart = intPart.replace(reg, "$1,$2");
}
num = intPart +"."+ pointPart;
}
return num;
} /**
* 去除千分位
*@param{Object}num
*/
function delcommafy(num){
num = num.replace(/[ ]/g, "");//去除空格
num=num.replace(/,/gi,'');
return num;
} function doit(val){
if(val.indexOf(",")>-){
$$("tx").value=delcommafy(val);
}else{
$$("tx").value=commafy(val);
}
} </script>
<body> <input type="text" name="tx" id="tx" onclick="doit(this.value)" value="" /> </body>
</html>